500300 Rev. U
Preventative Maintenance
6-5
an increase in both write and read errors. (This is true for all reel-to-reel tape
drives.)
3.
If more than 10% of the tapes used are 1-mil tapes, Qualstar recommends you
dedicate one particular tape drive to the use of thinner tapes.
If you use less than one reel in ten of 1-mil tape on any given tape drive, you should
use at least ten standard 1.5-mil tapes between each 1-mil reel.
Specifications
Your tape drive writes and reads digital data on 1/2-inch wide, 9-track magnetic
tape in a variety of recording formats. It is capable of true read-after-write operation
and operates in the streaming mode for maximum system throughput. It is self-
threading and can be configured for a variety of options.
The drive communicates with the system via the industry standard formatter
interface. Tape controllers that adapt this interface to nearly any modern mini,
micro, or personal computer are available from many sources. An optional SCSI-2
configuration is also available.
Available speeds and densities are model-dependent and are listed in Figure 1-2.
Qualstar reserves the right to modify product designs or specifications without
notice.
6.5
Data Specifications
6.5.1
Data Formats and Tape Speeds
All formats are ANSI/IBM compatible.
•
6250 CPI Group Code Recording (GCR) at 125 IPS or 62.5 IPS
•
3200 CPI Double Phase Encoding (DPE) at 62.5 IPS
•
1600 CPI Phase Encoding (PE) at 125 IPS
•
800 CPI Non Return to Zero Inverted (NRZI) at 125 IPS (read only)
6.5.2
Data Transfer Rate
•
GCR - 781 or 390 kilobytes per second
•
PE and DPE - 200 kilobytes per second
•
NRZI - 100 kilobytes per second (read only)
